Arpactophilus nemi, Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016

Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016, A review of the New Caledonian Arpactophilus (Hymenoptera: Crabronidae), Zootaxa 4063 (1), pp. 1-66 : 35

Arpactophilus nemi sp. nov.

( Figs. 73–74 )

Diagnosis. Arpactophilus nemi is the only New Caledonian species in the genus with the combination of two submarginal cells in the forewing, a black clypeus and reddish-black mandible ( Fig. 73 ), a dorsally-interrupted occipital carina ( Fig. 6 ) and a black metasoma ( Fig. 74 ) without a bulge on sternum II (as in Fig. 1 ).

Description. FEMALE: Total length 4.9 mm; forewing length 3.0 mm.

Body black, with areas of yellow and brown. Yellow: palpi; scape; pedicel; anterior pronotal margin; tegula; coxae apically; trochanters; femora basally and apically; tibiae; tarsi. Brown: flagellum; pronotal lobe; most of coxae; most of femora. Mandible reddish-black. Wings hyaline; pterostigma dark brown. Labrum not visible.

Head about 1.2 × as long as wide in frontal view. Apical margin of clypeus strongly projecting medially, with medioapical margin nearly straight ( Fig. 73 ). Labrum not visible. Ventral mandibular tooth about ¼–1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula probably 4:3 (not completely visible). Frons finely reticulate with short dense setae. Frontal carina present from median ocellus to midlength of clypeus, elevated to small point at basal clypeal margin. Scape 3.6 × as long as wide. Ocellar triangle anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli anterior of tangent by more than their diameter. Occipital carina interrupted dorsally ( Fig. 6 ). Gena imbricate with sparse punctation and associated setae, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate with bordering sparse and short transverse carinulae on hypostomal integument, slightly angulate at oral fossa.

Mesosoma about 1.8 × as long as wide in dorsal view. Propodeum about 0.9 × as long as wide in dorsal view. Mesosoma imbricate to colliculate ( Fig. 74 ), except dorsal surface of propodeum; lateral surface of propodeum also transversely carinulate; dorsal surface of propodeum transversely carinulate and basally reticulate (similar to pattern in Fig. 19 ). Pitted sulcus present posterior to mesoscuto-mesoscutellar sulcus. Hypersternal sulcus absent. Metafemur 2.6 × as long as wide. Metatibia without differently colored area apically. Pretarsal claws without teeth. Forewing with two submarginal cells; anterior border of submarginal cell II shorter than posterior border. Hind wing with five distal hamuli.

Metasoma polished, with sparse punctation ( Fig. 74 ). Metasomal sternum II without bulge (as in Fig. 1 ). Pygidium with broad row of silk setae.

MALE: Unknown.

Remarks. Arpactophilus nemi is similar most to the group of A. kumak , A. vamale , A. nyelayu , A. numee , A. xaragure , A. orowe , A. pwapwa , and A. arboreus in that all these species share a similar body size, coloration and a black clypeus with a medially strongly projecting apical margin that has no or only a small incision medially. In comparison to these species A. nemi has a flat metasomal sternum II that does not form a bulge. It is the only species with the combination of this clypeus form and color, a black metasoma and the absence of the bulge on the metasomal sternum II.

Material examined. HOLOTYPE ♀: “ NEW CALEDONIA 8926: 21°11’S x 165°18’E, 850m, Aoupinie top camp. 23 Nov 2001 – 1 Feb 2002. Burwell, Monteith. Malaise” [QM].

Etymology. The specific epithet is taken from the name Nemi , one of the New Caledonian native languages. It is treated as a noun in apposition.

Figures

FIGURES 71 – 76. Facial views and lateral habitus of ♀ holotypes of species of Arpactophilus Smith. 71. Arpactophilus merle sp. nov., facial view; 72. A. merle, lateral habitus; 73. A. nemi sp. nov., facial view; 74. A. nemi, lateral habitus; 75. A. nengone sp. nov., facial view; 76. A. nengone, lateral habitus.

FIGURES 5 – 9. Head and metatibial details of New Caledonian Arpactophilus Smith. 5. Schematic view of posterior of head of Arpactophilus, arrow indicates complete occipital carina; 6. Schematic with arrow indicating incomplete, dorsallyinterrupted occipital carina; 7: Metatibia of holotype ♀ of A. xaragure sp. nov., arrow indicating slightly differently colored but not differently-structured area apically; 8. Metatibia of holotype ♀ of Arpactophilus orowe sp. nov., arrow indicating differently colored and structured area apically; 9. Metatibia of paratype ♀ of A. orowe, scanning electron micrograph with arrow indicating concave area apically.

FIGURES 1 – 4. Line drawings of metasomata and forewings of New Caledonian species of Arpactophilus Smith. 1. Metasoma in profile of ♀ of Arpactophilus merle sp. nov., arrow indicates unmodified metasomal sternum II; 2. Metasoma in profile of ♀ of A. irwini Bohart, arrow indicates ventrally swollen metasomal sternum II. 3. Forewing of ♀ of A. irwini; ps: pterostigma, sz I: submarginal cell I, sz II: submarginal cell II. 4, Forewing of ♀ of A. caledonicus Bohart; ps: pterostigma, sz I: submarginal cell I.

FIGURES 16 – 22., Dorsal surfaces of ♀ of species of Arpactophilus Smith. 16. Arpactophilus concavus Bohart; 17. A. irwini Bohart; 18. A. kumak sp. nov. (holotype); 19. A. merle sp. nov. (holotype); 20. A. caac sp. nov. (holotype); 21. A. kraussi Bohart; 22. A. propodealis Bohart.